Clock.



No. 866,533. PATENTED SEPT. 17, 1907. C. B. STEPHENS.

CLOCK.

APPLICATION FILED FEB. 21. 1906.

i mented as taste dictates.

UNITED STATES PATENT oEEroE. y

CHARLES B. STEPHENS, OF GRANBY, CONNECTICUT.

CLOCK.

To all whom Ait may concern:

Be it known that I, CHARLES B. STEPHENS, a citizen of the United States, residing at Gran by7 in the county vof Hartford and State of Connecticut, have inventedA a new and useful Clock, of which the following is a a surface which will reflect the rays emanated at night i in such a manner that an eilicient glow results in the darkness.

This invention resides in a clock having a hollow dial with a luminous interior surface and having hour indicating characters applied about ils periphery in such manner as to exhibit a prominent contrast with the luminous surface and arranged so as to be exposed to the rays emanated from the interior of the dial and at the saine time to be easily observed from the iront, and having dark prominent pointers that extend from the bottom of the cavity toward the indicating characters about the periphery of the dial.

Figure l i` the accompanying views shows a front elevation ola clock that embodies the invention. Fig. 2 shows a diametrical section of the dial and the pointers.

The case l. of the clock may be formed of Wood, metal or other material, as desired, and may be orna- 'lhis case, however, must be considerable thicker than cases of the common clocks.

The dial 2 which is preferably formed of aluminium is hollow and is located in the case with the cavity opening toward the front. The cavity in the dial may be cylindrical, conical, or semi-spherical, but it is preferably parabolic, as shown in the drawings. The periphery of the dial is circular and ihe edge is prefe\ ably flared outwardlyat about an angle of 45 with the plane ol' the iront of the clock case. On the beveled or inclined outer edge oi the dial are the time indicating characters. These characters may be Roman or Arabic, as desired, or they may be letters, and they Specification of Letters Patent.

Application filed February 21,1906. Serial-N0. 302,198.

Patented sept. '17, 1907.

are preferably White on a square black ground. Through the center of the inner end is a perforation for i the minute arbor 3 and the hour sleeve 4f On the arbor is a minute hand-5 and on the sleeve is an hour .hand 6. These extend from the center outwardly and are preferably made of black material and rather heavy so as to be conspicuous by contrast with the surface of the dial.

g The entire innersurface of the hollow dial and prefer'- ably the portion of the rim between the time indicating characters is coated with a common luminous conn pound, that is7 a compound which is hard and which absorbs and stores light rays in the daytime and will throw off light raysv in the darkness to such an extent as to produce a glow.

When the dial is made with s. parabolic inner surface, such as is shown in the drawings, it has a large area for collecting and storing light rays in the daytime and oi course it has a correspondingly large surface lo glow at night and this surface reflects the rays in such manner as to intensify the glow.

The numbers on the flaring periphery of the dial are exposed to the rays thrown ofi by the luminous surface and consequently are readily seen and at the same time they are easily observable from the front of the clock so that they4 may be clearly read in the dark. The pointers are long and heavy and of a contrasting color and are arranged within the parabolic glowing conca-vity in such way that they offer a striking contrast and consequently are quite visible in the dark.

The invention claimed is 1. A clock having a case, a dial with a parabolic interior surface coated with luminons compound. said dial having', an angnlarly flaring,y outer edge, and time indient4 ina' characters arranged on the flaring edge, and pointers `arranged in the cavity and extending: toward the characters, substantially as specified.

2; A clock dial hnvlng.r a parabolic interior surface I eouied with luminous compound, snid dial having an all- 'gulurly flaring outer. edge and. time indicating charpefer,4 arranged on the flaring edge, substantially ns specitied.

CHARLES B. STEPHENS.

Witnesses ETuEr. M. Lowa, HARRY R. WILLIAMS. 

